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Graphical Processing Unit - a specialized, relatively inexpensive hardware unit built for fast graphical computations and highly data-parallel scientific computations.

12 votes
Accepted

Computing $\frac{x - y}{x - z}$ when $x,y,z$ are close to each other

If your inputs are $x,y,z$, this computation is not unstable, but ill-conditioned. That's worse, because it means that a small change in your input (such as a previous approximation as a floating-poin …
Federico Poloni's user avatar
1 vote
Accepted

MATLAB : find an algorithm to inverse quickly a large matrix of symbolic variables

The inverse of the (1,1) block of $$ \begin{bmatrix} A & B\\ C & D \end{bmatrix}^{-1} $$ is $A-BD^{-1}C$ (Schur complement). This is what you are trying to compute, if I understand correctly from your …
Federico Poloni's user avatar